Interferometric crosstalk, arising from the detection of undesired signals at the same nominal wavelength, may introduce large power penalties and bit-error rate (BER) floor significantly restricting the scalability of optical networks, In this paper, interferometric crosstalk reduction in optical wavelength-division-multiplexing (WDM) networks by phase scrambling is theoretically and experimentally investigated. Enhancement of 7- and 5-dB tolerance toward crosstalk is measured in a 2.5-Gb/s transmission link of 100 km and 200 km of SSMF, respectively. This result proves the feasibility of optical networking in the local area network/metropolitan area network (LAN/MAN) domain while tolerating the relatively high crosstalk levels of present integrated optical switching and cross-connect technology. Experiment is in good agreement with theory. Recommendations on the use of phase scrambling to reduce crosstalk in WDM systems are given.
Tafur Monroy, I., Tangdiongga, E., Jonker, R., & Waardt, H. D. (2000). Interferometric Crosstalk Reduction by Phase Scrambling. IEEE Journal of Lightwave Technology, 18(5), 637-646. https://doi.org/10.1109/50.842077